How to hide the secret word in the image code?

Question

Programming

You need to make sure that when you open an image in a text editor, you can find a word that does not belong to the image code.

Answer 1

cat lena.png <(echo "Dratute!") > 4elena.png

Answer 2

You need to work with the meta date.
Look at which field is free and enter the word
dev.exiv2.org/projects/exiv2/wiki/The_Metadata_in_...
For example, in a comment

Answer 3

Answer 4

How to hide the secret word in the image code?

It is better to use "watermarks", as graphic editors either rewrite tags or delete them altogether (and with them clean up unused space to reduce the size.
Creating a watermark .

Answer 5

rarjpeg .

Answer 6

Steganography.